In previous articles I have discussed the ins and outs of NFPA 58, that connecting a hot head torch to a bulk tank is against code and therefore illegal etc ad nauseum…but I have not presented any “proof” of exactly WHY it is hazardous to do so.
There is a mathematical formula which converts flow of a particular gas in a line to a volume. Here is the formula:
V = 58 * SQRT((p * (d^5))/(W*L))
V equals volume flow in CFM
p equals difference in pressure between two ends of the hose in PSI
d equals ID of the hose in inches
W equals weight in pounds of one cubic foot of the gas
L equals the length of the hose in feet. Continue reading